Side seal for linear motion guide unit

Abstract

The need for a related-art nipple 3 is eliminated to lift restriction on the stroke of the slider S. A tubular protrusion 9 is provided on the face of a seal body H facing an end cap C, and maintains a positional relationship of being inserted into a lubricant supply hole 8 formed in the end cap when the face of the seal body faces the face of the end cap, and it has an insertion portion 9 a receiving insertion of a lubricant supply nozzle 10 for a supply of lubricant, and a supply port 9 b connected to a rolling-element directing passage 7 via the lubricant supply hole when it is inserted into the lubricant supply hole. A seal element is created on the insertion portion 9 a and makes close contact with the lubricant supply nozzle in a process of inserting the lubricant supply nozzle into the insertion portion.

What is claimed is: 
     
       1. A side seal for a linear motion guide unit, comprising
 a seal body that is mounted on an outer side of an end cap mounted on each of the opposite ends of a slider and has a supply port formed therein for a supply of lubricant to a rolling-element directing passage formed in the end cap, and 
 a tubular protrusion that is provided on a side face of the seal body facing the end cap, maintains a positional relationship of being inserted into a lubricant supply hole formed in the end cap when the side face of the seal body faces a side face of the end cap, and comprises an insertion portion receiving insertion of a lubricant supply nozzle used for a supply of lubricant, and a supply port connected to the rolling-element directing passage through the lubricant supply hole in a condition in which the tubular protrusion is inserted in the lubricant supply hole, and 
 a seal element created on the insertion portion and making close contact with an outer periphery of the lubricant supply nozzle a process of inserting the lubricant supply nozzle into the insertion portion. 
 
     
     
       2. The side seal for a linear motion guide unit according to  claim 1 , wherein the insertion portion of the tubular protrusion into which the lubricant supply nozzle is inserted has an inner diameter tapered from an end of the insertion portion opposite to a contact face with the slider toward the lubricant supply hole. 
     
     
       3. The side seal for a linear motion guide unit according to  claim 1 , wherein the tubular protrusion has an outer diameter smaller than an inner diameter of a portion of the lubricant supply hole of the end cap into which the tubular protrusion is inserted, in order to create clearance. 
     
     
       4. The side seal for a linear motion guide unit according to  claim 3 , wherein the insertion portion of the tubular protrusion into which the lubricant supply nozzle is inserted has an inner diameter tapered from an end of the insertion portion opposite to a contact face with the slider toward the lubricant supply hole.